Troubleshooting - Mitsubishi Electric PAC-IF033B-E Operation Manual

3 . S er v i c e a nd m a i nt ena nc e
T r o u b l es h o o t i ng
The following table is to be used as a guide to possible problems. It is not exhaustive and all problems should be investigated by the installer or another competent person.
Users should not attempt to repair the system themselves.
F a u l t s y m p t o m
Cold water at taps
(system with DHW tank)
Heating system does not get up to
set temperature.
An error code appears in the main
remote controller display.
<Power failure>
All setting will be saved for 1 week with no power, after 1 week Date/Time ONLY will be saved.
en
E N - 4
Possible cause
All hot water from DHW tank used
Heat pump or electric heaters not working
Prohibit, schedule or holiday mode selected
Incorrectly sized heat emitters
The room thermostat is located is at a different tem-
perature to the rest of the house.
The indoor or outdoor unit is reporting an abnormal
condition
S o l u t i o n
Ensure DHW mode is operating and wait for DHW tank to re-heat.
Contact installer.
Check settings and change as appropriate.
Contact installer.
Reposition the room thermostat to a more suitable room.
Make a note of the error code number and contact installer.